Synthesis and structural characterization of an azatitanacyclobutene: the key intermediate in the catalytic anti-Markovnikov addition of primary amines to ?-alkynesDedicated to Professor Mike Lappert on the occasion of his 75th birthday.Electronic supplementary information (ESI) available: experimental procedures. See http://www.rsc.org/suppdata/cc/b3/b316383k/Ward, Benjamin D.; Maisse-Fran�ois, Aline; Mountford, Philip; Gade, Lutz H. · Chemical Communications · 2004